To improve the mounting workability of a temperature detector having temperature detecting elements, reduce the installation space of the temperature detector, and improve the response performance of temperature detection, when the plurality of temperature detecting elements are used.

The temperature detector 80 includes a frame-like substrate 82 and the temperature detecting elements 90 for detecting the temperature of a detecting object 24 in a non-contact status with the detecting object 24. The temperature detecting elements 90 are arranged in the inner space 89 surrounded by the substrate 82 at a position separated from the substrate 82 by a predetermined distance. The plurality of temperature detecting elements 90 are arranged in one inner space 89 at intervals.